The modifications were done by Sentry Aerospace Industries and Lambda Integrated Defense Systems, the same cooperation company in building the supersonic VVIP / Presidential aircraft, the VC-711 Cruiser One [link] . Which mean the ER-70 Guardian Angel has same engine performance and configurations.

The ER-70 is an airborne warning and control system (AWACS), but without the bulk rotary radome on it's fuselage, because it could sacrifice its supersonic speed and high maneuver capability. Instead, The ER-70 used sets of canoe-shaped radome spread all over the fuselage.